SSL/TLS Certificate Lookup
Check a domain's SSL/TLS certificate — who issued it, when it expires, and whether the chain is trusted
f-tekno.jp
SSL/TLS Certificate
SSL/TLS Certificate for f-tekno.jp
Valid- Issued by (CA)
- Let's Encrypt
- Subject
- f-tekno.jp
- Valid from
- Jul 31, 2026
- Valid until
- Oct 29, 2026 (49 days remaining)
- Public key
- RSA 2048-bit
- Serial
- 06DF760EF07A8028000F3BA155D56A9B6459
- SHA-256 fingerprint
- EF:1B:B0:03:41:0B:F1:E3:2D:51:68:E5:D4:3A:E9:EC:A5:C7:1D:F8:98:5D:D3:4C:74:3A:F0:E9:0B:BB:F5:EA
- Chain
- YR2 → Root YR → ISRG Root X1
Certificate Authority Authorization (CAA)
No CAA policy is published for this domain — any certificate authority may issue for it.
Never get surprised by f-tekno.jp's certificate expiring
This is today's certificate. Turn on monitoring and we'll watch f-tekno.jp continuously, notifying you the moment anything moves across all three signals:
Uptime
We visit the site from multiple regions worldwide and email you within minutes if it goes down, with a per-region breakdown so a real outage stands out from a regional blip.
DNS changes
We watch NS, MX, CAA, DNSSEC, CNAME and A/AAAA records, and identify the host, network, and ASN behind them, so a real migration or hijack stands out from routine noise.
TLS certificate
We warn you 30, 14, 7, and 1 days before it expires, and flag it if the issuing authority changes or the certificate is unexpectedly replaced.
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